You can easily merge two customers into one from the Customers Tab.
Note: In order for this to work please contact SellerCloud Support and ask to enable AppSetting:
EnableMergeCustomers = true
- Select the users from the list and then Merge Customers from the Action menu.
- A new screen will let you choose the user that will remain in SellerCloud, while all others will merge into it. Click on the checkbox and select Merge Customers.

Note: Any orders related to the merged customers will be transferred to the remaining one.